Last week, we had a nice close look at Sapphire's overclocked HD4890, known as the Toxic Edition. This week, we are taking it a step further with the Sapphire Atomic Edition. For those not familiar with the Atomic Editions, this is the cream of the crop for Sapphire cards. The Atomic editions have the highest clocks, the best cooling and the best bundles. They also tend to be very limited production runs with a price that represents that scarcity. The 4870X2 Atomic edition we reviewed last December was an absolute treat of a GPU, and a product that was both rare and impressive. Will the HD4890 Atomic Edition live up to this rare pedigree? Find out, right here at Club Overclocker!